explain why a graph showing the relationship between the amount of a particular element and the element's mass is a straight line?

Answer 1

Mass is a measure of "amount". They mean the same thing. Therefore the relationship is linear.

If you are referng the mass of one atom, or a fixed number (e.g. Avogadro's numbder) of atoms, then of course the "amount" (mass) is proportional to the mass of each atom

Answer 2

Because the energy in the element is at the lowest.

Answer 3

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Answer 4

I’m dying

Answer 5

you're welcome science class